Most any HI-Z mic will do. You can use a crystal mic, you can use a dynamic mic with an impedance step-up transformer, you can use most any mic with a preamp, etc.
Nothing magic about "crystal" per se. As others have said, the D-104 can be a good choice, but it is a buyer-beware situation. The elements are degraded by high heat and humidity, and eventually plain old age takes its toll, and if that has happened the mic will sound thin and "tinny". It's hard to tell what you're getting if you buy one off the 150 deg F hood of a pick'em-up truck at a 'fest (in fact, if you do that you have a high probability of getting a bad element). Astatic/Omnitronics no longer manufactures or supplies D-104 elements to resellers, but apparently they still have new ones, and will (for a price) replace them if you send them the mic. Grant/NQ5T > Excuse me...'senior moment'...I need one...anyone have one for sale?
